柴达木盆地一里坪富锂卤水储层非均质性及对卤水开采的影响

The Reservoir Heterogeneity of Reservoirs and Its Impact on the Brine Recovery in the Yiliping Area，Qaidam Basin

中文关键词:  非均质性  卤水储层  一里坪  柴达木盆地

英文关键词:Heterogeneity  Brine reservoirs  Yiliping Salt Lake  Qaidam Basin

中文摘要:

      在盐湖卤水长期的研究和开采工作中，储层非均质性的问题极少被关注。随着深部卤水的利用强度加大，难开采卤水储层非均质性的问题逐渐受到重视。以柴达木盆地一里坪富锂卤水储层为研究对象，根据其储层的岩性和展布特征，从垂向和平面两个角度进行了探索性的研究。结果表明，浅部第 I卤水矿层储层的非均质性弱于深部，晶间型卤水储层非均质性略弱于孔隙型卤水储层。平面上，非均质性弱的深部优质储层主要位于研究区东北部，单个连续的富水储集体延伸范围多变，常为 300～800 m。因此，应优先在非均质性弱的东北部布置采卤工程，并根据富水储集体的展布特征优化开采井的深度和间距，提高开采效率。

英文摘要:

      Although considerable work on brine exploration of the modern salt lakes have been conducted inthe past decades，research on reservoir heterogeneity is still rare. In recent reservoir heterogeneity of brine in.creasingly attracts more attention due to the intensified utilization of deep brine that difficult to mining. Thisstudy focuses on the reservoirs of Li-rich brine in Yiliping area of the Qaidam Basin and tentatively exploresvertical and horizontal development of these reservoirs according to the petrology and distribution of reservoirs.The results show that，heterogeneity of the I and porous brine reservoirs is weaker than that of the deep and in.tercrystalline brine reservoirs，respectively. High-quality deep reservoirs with weak heterogeneity mainly dis.tributed in the northeast part of the studied area. The extent of single brine-enriched reservoir varies signifi. cantly，ranging from 300 to 800 m orizontally. Therefore，mining engineering of brine can be preferred at thenortheast of studied area with a low heterogeneity and the depth and interval of exploitation well should be opti.mized on the basis of brine-rich reservoir distribution in order to enhance recovery efficiency.